An adaptive antenna array with parallel beamformers for indoor radio channel enhancement

A method for improving the performance of an uplink direct sequence code division multiple access (DS-CDMA) communication system for an indoor channel is presented. Spatially smoothed MUSIC is used to separate multipath within a chip duration. Angle and time diversity are realized using parallel beamformers with RAKE receiver for reducing space and frequency selective fading. Three dimensional ray tracing is used for obtaining vector channel impulse response in a multiuser indoor environment incorporating perfect power control. Simulations are carried out inside a corridor of a multistorey building. Numerical results indicate that the proposed smoothed adaptive beamforming method obtains significant improvement in the channel capacity.